Everyone is a shill for whatever Cryptocurrency they own or support. Even I am guilty of that myself, although I try my best to remain objective nonetheless.
Some people are much worse than others though, over time you will figure out the people that are subjective and the people that are objective, and form your opinions with this in mind. It can take a long time to learn people's posting habits though, and it requires a lot of reading. If you don't spend a lot of time in these subforums I would take everything you read with a grain of salt.
I think its fine if one supports his/her own currency, its just that people go into the "FUD" "FUD" mode which concerns me. I am trying to learn how to separate wheat from chaff but its too difficult when you get slammed for asking dev a difficult question,