I had this issue before. I was complaining about a product on a forum and was a bit annoyed because it was expensive and did not work properly. I didn't call them names, but it was obvious in my tone that I was dissatisfied. Sadly, the moderators on that forum called it "trolling" and I got banned. Those moderators sadly also made money through the company I complained about since the forum is linked to the store.
For example, you are not nice if you say:
trumptards do x,y
You are nice if you say:
x,y is not good in my opinion, because (list of arguments without resulting to offensive stuff)