I get accused of hacking all the time in shooters. Because apparently just being good at something (or your opponent being that awful) is enough to raise suspicion.
Of the many, many accusations... I think for the obligatory example I'll go with one time when I was playing Modern Warfare 2.
The map was Highrise. I was using the SPAS-12 (Foregrip, Ext. Magazine) (had a buddy drop it for me) for my primary weapon and the Glock-18 (Dual Wield, Ext. Magazine) for my secondary. Perks were Bling Pro, Stopping Power, and Steady Aim. I was primarily using the dual Glock-18s, switching to the SPAS-12 when ammunition ran dry. Yeah, yeah... I know, Glock-18s are "noobish" and all that jazz. Heard it all before, and frankly, find it stupid. If something is effective, you're only gimping yourself by not using it. Besides, I was tired of leveling up with the assault rifles and needed to blow off some steam. Anyway... I was doing pretty well that particular game. I had upwards of 30 kills with only 3 or 4 deaths by the end.
Around the time that I hit 10 kills, player REDACTED decided to start calling me out as being a hacker and insulting my "hacking ability" because I had to use the Glock-18s to make it work. I paused my warpath to inform him that I was not, in fact, hacking. He continued to rant for the rest of the game. His score by the end was 5 or 6 kills to upwards of 20 deaths. I got a chuckle out of that.