In real life I’m also considered argumentative. People that know me and people that I work with generally accuse me of arguing that black is white. When that happens I generally tell them that as black and white are just arbitrary names that have become custom and practice over the years then black could easily be white as custom and practice is not law. I’ve also got another one about black and white not being colours. I don’t act like this around people that I don’t know though unless they present themselves as having a sense of humour as I realise that a lot of people wouldn’t appreciate this kind of response.
For instance in real life if knew you, your “I’m neither a sexist nor a racist” remark would be met with “well that’s what all sexist/racists would say”. I wouldn’t do that on here though as it would probably be considered trolling.
I don’t have a social media account of any kind for just the very reason you describe. People can post some ridiculous things in public spaces but I sincerely believe, just as Irisado does, all they expect is +1 or “like” responses. I also believe that is all that the majority of them want.
On an animal rescue website that my Wife is a member of a dog owner posted a picture of himself throwing a stick onto a pond that had iced over. You wouldn’t believe the amphetamine parrot storm that this resulted in. One member accused the dog owner of animal cruelty and of being an idiot and a moron whilst just about everybody else supported the dog owner. Was the concerned member correct? Maybe, but the language of their argument turned them into a troll.
I find the internet a strange place and by and large it annoys me. LOL & troll are two examples of why. For me LOL stands for loss of land or lots of love but because social media is driven by the younger people a lot traditional values are getting lost. I have known my young Niece to actually “LOL” instead of laugh. Internet values have no place outside of the internet; troll, in its internet guise, is a word that only really has meaning within the internet. Language has a long and meaningful past but the internet is changing that and people are using words that are fairly subjective in their meaning without fully understanding them. Popularity of a word is now overtaking any real value of the word. As an example instead of a troll you could well be considered a griefer.
Long story short, don’t confuse real life with the internet. If someone on the internet accuses you of being a troll then, in that particular instance, you are simply because that is the way the internet and the word work.