If you are playing in a specific, established setting, some people will have an expectation that you adhere to the “rules” for that setting.
Others will be fine with whatever.
To me, showing up with pink space marines is no different from showing up with pink Wehrmacht.
Some people will think it’s the coolest thing ever, others will think it’s annoying.
Play with people who think the same you do 🙂
Nordic Weasel Games