Things that do not make you a “bad” or “lesser” fan:
being into smut/not being into smut (though if you post/reblog smut, please remember to tag it! ;-) )
not knowing as much as some people about the thing you like
being attracted to certain characters/people
liking a certain thing from that series more than another thing from it
The only thing that could ever make you a “bad” or “lesser” fan is when you act condescending and rude to other fans for doing things differently or knowing less than you. Remember that you used to be a “new fan” at some point in your life, too. Please treat everyone with kindness, respect, and understanding; we’ll all be able to have a much more enjoyable fandom experience for it.