There's a lot of obnoxious-ass people on the internet, the best advice we can give is to not crawl down to their level. But once in awhile somebody just snaps. Example, Darrelle Revis, who went off on a few Patriots fans who were mad he left New England to return to New York. Take your pick of what's worse: His grammar, calling a dude a cunt, or (in the same comment) saying this year's championship was him "doing Tom [Brady] a favor.":
A lot of people probably predicted this was coming at some point:
That outburst did seem a bit over the top. Scan his social media accounts and come to your own conclusions.
Send all complaints, compliments, and tips to firstname.lastname@example.org