No they don't actually, that's just something you are telling yourself to ease your mind and to excuse your own behavior. There is no need to provide a counterweight because somebody else is positive about a person. Imagine working in a company where one of your bosses is praising your work, and that the other boss feels the need to put you down every chance he gets just to counter his colleague because "the two go together". This is not how things work and neither is it ok. It's even offputting when football fans do it, where you in fact do have a "them against us" culture. Imagine two parents showing this behavior towards their children.
What would go together, which is clearly what you are mistaking your own behavior for, is when the same person were both critical as well as positive, depending on the conditions. A boss praising you when you did a good job, and the same boss giving you crap when you made a mistake. THAT would be normal and THOSE TWO indeed go together. Not one parent doing all the praising and the other doing the opposite.
Please, tell me, do you think repeatedly calling a cyclist names like "the baby" among other things is reasonable, polite or humorous? It is none of those, trust me. And even if at one point it might have been considered funny, the joke died ages ago. This is also not "an opinion", and people don't get to hide behind that excuse. It's trolling, plain and simple. The fact that you have felt the need to do so for years now, shows that it is in fact personal to you, which ironically is exactly what you like to blame others of. If it weren't personal, it wouldn't be worth your trouble. So since it is in fact personal, the motive is to rile up other posters. Hence, trolling.
And i would like to believe most people would prefer to live in a positive world, and value positivity over constant criticism (and let's be real here, it's not being critical that is the problem). So people being positive should not be an alibi to be able to shitpost.