רַבִּי יְהוֹשֻׁעַ אוֹמֵר, עַיִן הָרָע, וְיֵצֶר הָרָע, וְשִׂנְאַת הַבְּרִיּוֹת, מוֹצִיאִין אֶת הָאָדָם מִן הָעוֹלָם:
Rabbi Joshua said: an evil eye, the evil inclination, and hatred for humankind put a person out of the world.
עַיִן הָרָע. כְּמוֹ עַיִן רָעָה, שֶׁאֵינוֹ מִסְתַּפֵּק בְּמַה שֶּׁיֵּשׁ לוֹ וּמְחַזֵּר אַחַר דְּבָרִים אֲחֵרִים. וְיֵשׁ מְפָרְשִׁים עַיִן הָרַע, שֶׁמַּכְנִיס עַיִן הָרַע בְּמָמוֹן חֲבֵרוֹ אוֹ בְּבָנָיו וּמַזִּיק לוֹ:
"The evil eye": [This is] like "an evil eye," which does not suffice with what he has and seeks other things. And some explain, "the evil eye" - that he inserts the evil eye into the money of his friend or his children and hurts him.
Rabbi Samson Raphael Hirsch on Chapters of the Fathers 2:11
. . . The Sages use a beautiful expression to describe men in their admonitions (advice) to us to love mankind and shun malice (avoid harming others). They call our fellow men "brios," "creatures" of G-d, and they employ this term to include all men, without exception, thus stressing the motive which is at the basis of the behest to love all men. We are to respect in a human being, whoever and whatever he may be, the "creature of G-d" and we must not deny this love to any fellowmen, seeing that we were all made by the same Creator.
. . . The Sages use a beautiful expression to describe men in their admonitions (advice) to us to love mankind and shun malice (avoid harming others). They call our fellow men "brios," "creatures" of G-d, and they employ this term to include all men, without exception, thus stressing the motive which is at the basis of the behest to love all men. We are to respect in a human being, whoever and whatever he may be, the "creature of G-d" and we must not deny this love to any fellowmen, seeing that we were all made by the same Creator.
The above text might be a bit difficult to understand, but it is beautiful once you do. Rav Hirsch is focusing on the use of the word "brios" in the phrase "sinas ha'brios." It comes from the root word of "barah," create, and literally translates to mean "creatures or "creations." Rav Hirsch is focusing on the fact that the mishnah chooses to use that term. He explains that the reason you need to show respect to others is because they are Hashem's creations - He created them just like He created you.