'Obnoxious zealots' is probably a more common perception of these people
I've never _ever_ had anybody preach to me about some tech/event/company that they put a sticker of. My laptop is mine and I don't give a damn about what others think about it. I assume that this is the case of the vast majority of people who put stickers there.
This whole conversation reminds me of people complaining about vegans preaching.