I wouldn't wear a back patch because I don't want to be mistaken for a 1% dirtbag.
It amazes me that a bunch of folks decide to show their rebellious individual spirit by making a bunch of rules and then demanding everybody else respect and follow them. I'm sure some of them are fine folks, but anyone that is going to get upset over what someone else puts on their jacket really needs to grow up and get over themselves.
With that said, I've nothing against the wearing of patches or showing pride in a club you belong to, just don't expect the rest of the world to be impressed.