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אֵ֣לֶּה ׀ תֹּלְד֣וֹת יַעֲקֹ֗ב יוֹסֵ֞ף בֶּן־שְׁבַֽע־עֶשְׂרֵ֤ה שָׁנָה֙ הָיָ֨ה רֹעֶ֤ה אֶת־אֶחָיו֙ בַּצֹּ֔אן וְה֣וּא נַ֗עַר אֶת־בְּנֵ֥י בִלְהָ֛ה וְאֶת־בְּנֵ֥י זִלְפָּ֖ה נְשֵׁ֣י אָבִ֑יו וַיָּבֵ֥א יוֹסֵ֛ף אֶת־דִּבָּתָ֥ם רָעָ֖ה אֶל־אֲבִיהֶֽם׃
This, then, is the line of Jacob: At seventeen years of age, Joseph tended the flocks with his brothers, as a helper to the sons of his father’s wives Bilhah and Zilpah. And Joseph brought bad reports of them to their father.

את דבתם רעה. כָּל רָעָה שֶׁהָיָה רוֹאֶה בְאֶחָיו בְנֵי לֵאָה הָיָה מַגִּיד לְאָבִיו, שֶׁהָיוּ אוֹכְלִין אֵבֶר מִן הַחַי, וּמְזַלְזְלִין בִּבְנֵי הַשְּׁפָחוֹת לִקְרוֹתָן עֲבָדִים, וַחֲשׁוּדִים עַל הָעֲרָיוֹת, וּבִשְׁלָשְׁתָּן לָקָה: וַיִּשְׁחֲטוּ שְׂעִיר עִזִּים בִּמְכִירָתוֹ וְלֹא אֲכָלוּהוּ חַי, וְעַל דִּבָּה שֶׁסִּפֵּר עֲלֵיהֶם שֶׁקּוֹרִין לַאֲחֵיהֶם עֲבָדִים – "לְעֶבֶד נִמְכַּר יוֹסֵף", וְעַל עֲרָיוֹת שֶׁסִּפֵּר עֲלֵיהֶם, וַתִּשָּׂא אֵשֶׁת אֲדֹנָיו וְגוֹ:

את דבתם רעה THEIR EVIL REPORT — Whatever he saw wrong in his brothers, the sons of Leah, he reported to his father: that they used to eat flesh cut off from a living animal, that they treated the sons of the handmaids with contempt, calling them slaves, and that they were suspected of living in an immoral manner. With three such similar matters he was therefore punished. In consequence of his having stated that they used to eat flesh cut off from a living animal Scripture states, (Genesis 37:31) “And they slew a he-goat" after they had sold him and they did not eat its flesh whilst the animal was still living. And because of the slander which he related about them that they called their brothers slaves — (Psalms 105:17) “Joseph was sold for a slave.” And because he charged them with immorality (Genesis 39:7) “his master’s wife cast her eyes upon him etc.” (Genesis Rabbah 84:7).
This comment has a symmetrical midrashic structure. The prooftexts in the second half (texts in yellow) correspond to the specific דבות in the first half. The words in blue are halakhic concepts.
(ג) וְיִשְׂרָאֵ֗ל אָהַ֤ב אֶת־יוֹסֵף֙ מִכׇּל־בָּנָ֔יו כִּֽי־בֶן־זְקֻנִ֥ים ה֖וּא ל֑וֹ וְעָ֥שָׂה ל֖וֹ כְּתֹ֥נֶת פַּסִּֽים׃
(3) Now Israel loved Joseph best of all his sons—he was his “child of old age”; and he had made him an ornamented tunic.

בן זקנים. שֶׁנּוֹלַד לוֹ לְעֵת זִקְנָתוֹ. וְאֻנְקְלוֹס תִּרְגֵּם בַּר חַכִּים הוּא לֵהּ – כָּל מַה שֶּׁלָּמַד מִשֵּׁם וָעֵבֶר מָסַר לוֹ. דָּ"אַ, שֶׁהָיָה זִיו אִיקוֹנִין שֶׁלוֹ דּוֹמֶה לוֹ:

בן זקנים THE SON OF HIS OLD AGE — because he was a wise son to him” — all that he had learnt from Shem and Eber he taught him (Genesis Rabbah 84:8). Another explanation of בן זקנים— his facial features were similar to his (Jacob’s) (Genesis Rabbah 84:8).
בַּר חַכִּים- son of wisdom. Rashi is commenting on Onkelos' Aramaic translation.
וַיִּרְא֣וּ אֶחָ֗יו כִּֽי־אֹת֞וֹ אָהַ֤ב אֲבִיהֶם֙ מִכׇּל־אֶחָ֔יו וַֽיִּשְׂנְא֖וּ אֹת֑וֹ וְלֹ֥א יָכְל֖וּ דַּבְּר֥וֹ לְשָׁלֹֽם׃
And when his brothers saw that their father loved him more than any of his brothers, they hated him so that they could not speak a friendly word to him.
ולא יכלו דברו לשלום. מִתּוֹךְ גְּנוּתָם לָמַדְנוּ שִׁבְחָם, שֶׁלֹּא דִבְּרוּ אַחַת בַּפֶּה וְאַחַת בַּלֵּב:
ולא יכלו דברו לשלום AND THEY COULD NOT SPEAK PEACEABLY TO HIM — from what is stated to their discredit we may infer something to their credit: they did not speak one thing with their mouth having another thing quite different in their hearts (Genesis Rabbah 84:9).
דברו. לְדַבֵּר עִמּוֹ:
דברו means TO SPEAK TO HIM.
Why does Rashi need this comment? How else might you understand דברו?
וַיְסַפֵּ֣ר אֶל־אָבִיו֮ וְאֶל־אֶחָיו֒ וַיִּגְעַר־בּ֣וֹ אָבִ֔יו וַיֹּ֣אמֶר ל֔וֹ מָ֛ה הַחֲל֥וֹם הַזֶּ֖ה אֲשֶׁ֣ר חָלָ֑מְתָּ הֲב֣וֹא נָב֗וֹא אֲנִי֙ וְאִמְּךָ֣ וְאַחֶ֔יךָ לְהִשְׁתַּחֲוֺ֥ת לְךָ֖ אָֽרְצָה׃
And when he told it to his father and brothers, his father berated him. “What,” he said to him, “is this dream you have dreamed? Are we to come, I and your mother and your brothers, and bow low to you to the ground?”
הבוא נבוא. וַהֲלֹא אִמְּךָ כְבָר מֵתָה, וְהוּא לֹא הָיָה יוֹדֵעַ שֶׁהַדְּבָרִים מַגִּיעִין לְבִלְהָה שֶׁגִּדְּלַתּוּ כְּאִמּוֹ. וְרַבּוֹתֵינוּ לָמְדוּ מִכָּאן שֶׁאֵין חֲלוֹם בְּלֹא דְּבָרִים בְּטֵלִים, וְיַעֲקֹב נִתְכַּוֵּן לְהוֹצִיא הַדָּבָר מִלֵּב בָּנָיו שֶׁלֹּא יַקְנִיאוּהוּ, לְכָךְ אָמַר לוֹ הֲבוֹא נָבוֹא וְגוֹ' – כְּשֵׁם שֶׁאִי אֶפְשָׁר בְּאִמְּךָ כָּךְ הַשְּׁאָר הוּא בָטֵל:
הבוא נבוא SHALL WE INDEED COME — “Is not your mother long since dead?” He did not, however, understand that the statement really alluded to Bilhah who had brought him up as though she were his own mother (Genesis Rabbah 84:11). Our Rabbis inferred from here that there is no dream but has some absurd incidents (Berakhot 55). Jacob’s intention in pointing out the absurdity of Joseph’s mother, who was dead, bowing down to him was to make his sons forget the whole matter so that they should not envy him, and on this account he said to him, “Shall we indeed come etc.” — meaning, just as it (the fulfillment of the dream) is impossible in the case of your mother so the remainder of the dream is absurd.