Commenting on the "childish" behavior of another is to take just as judgemental a stance as to slur a company's name. Both are done in an attempt to sway the readers' opinions beyond what the reader might otherwise have decided on their own. That is, we all already have opinions on terms like microshit/microslop, and we all already have opinions on those who use those terms. Weighing in with yours just publically registers your thumb on the scale.

One could make the opposite point, were one motivated to do so, that because the words we use are important, the use of terms like microslop could convey meaning that the author intended to convey - that they are so displeased as to feel averse to using the companies name. This is a useful construction, and we see it all the time in other useages such as "No, not that one, that (said with animosity) one" or "They who shall not be named" or in taboos such as the F, N, and R words. Choosing to use certain words over others, or certain constructions over others, can and often does carry important information. Here, the writer did not have to write "Oh, I really hate Microsoft, by the way" because we are all capable of inferring that from the single word slur.

We're allowed to have opinions, no? We're allowed to share our opinions with others, surely? And we're allowed to do so in ways that we are comfortable with?

Personally, I draw the line at insulting other humans by inflicting my own judgement upon them, but that's just me sharing my opinion. No real need to run around "correcting" people's tone/style/punctuation/spelling when I do not know what they intended. It's entirely possible that one engaging in something that you see as childish is doing so on purpose - perhaps as commentary on the nature of the situation, or in a way to comically throw ones hands in the air, because that is how they feel comfortable communicating, or simply because that is the range of their communicative ability.