definitely not!
woah man, if that was THE rule, we'd all be dead by now.. or at least i'd have every guy i see colored like that dead. lol.
seriously, i think it's a matter of taste... or, as we put it in CVG1's liking to Candymag (sorry tol... had to have an example... hehe)- KANYA-KANYANG TRIP LANG YAN... whatever works for you bro- as long as:
1. kaya mong dalhin
2.no one'll be offended (in the case of your PARLORICALLY FAGGISH FRIEND, you WERE offended/confused/downright sickened by the sight... so i guess that's a big no-no)
and aren't hair coloring products harmful to the skin? (i.e. we wear GLOVES when applying them) so i guess coloring your hair- other than the one on your head (no, not your SMALL head... the one on your neck, bro... yep, THAT head. wadyamean, it's not small? hehe) could be hazardous to your health... lol... besides, if you happen to be in a jeepney with me, it could be hazardous too... imma kill you... bwahaha... joke lang po...