While I can't comment on his suicide I can say there are ways to deal with being in that type of situation. Having once been the type of soldier who was an easy target for his peers and SGTs to pick on I found my solution. In becoming a hard target. PT'd more, learned my weapons till I was blue in the face, know my job, NCO creed, went to the soldier of the month board and nailed it. That way when I was called gay (I'm not) or a black joke was thrown around (they were) nothing stuck, because I out PT'd the guys that did it and I was better at my job. And for those who were my peers in PT and skill knowledge I still was a better soldier. Didn't go out drinking with underage soldiers. Didn't smoke spice. Stayed true to my army values.
Admittedly combat arms isn't for everyone. It takes a special person to stick with what's expected of you and put up with a lot of the cliques and back stabbing that rolls around. That's why I'm at DLI