If they are convicted then no I will not support them.
Ok, let's say there's irrefutable evidence that the victim's flirted with these guys, they asked him to stop, he didn't so they beat him up. Maybe there was a bystander with a video camera who caught every detail of the events. Then say the case got dismissed because of some technicality. They're absolutely guilty, even admit to it, but they get off free and clear because, I dunno, the arresting cop mispronounced a word when reading them their rights. Would you support them then?

If they were harassed and warned the guy then so be it what happened, happened.
Let's say a female friend or relative of yours is at a bar. She flirts with a guy in a military uniform, who says "I'm not interested" or "I'm married." Or maybe she's just unattractive or annoying or something. Doesn't matter. He's not interested. Despite his request that she back off, she keeps flirting with him. He finally gets sick of it and punches her square in the face, full force. You would, I assume, be ok with this and defend the guy who was being harassed.