Two major, critical parts of communication; body language and tone, are not transmitted on the internet. We cannot gauge the attitude of a person when we read their text so our minds 'fill in the blanks' for us. It was probably all just a miscommunication. Sometimes people can be rude on TPF, but most of the time I think they are just typing quickly and failing to be delicate with criticisms. I don't think that was the intention here. I can't speak for the others, but I just caution you, OP, not to get your feelings hurt. You're only reading the words, not seeing the person or hearing the tone of their voice.
We all make typos and I don't think it was a reflection on you by any means, but we also all have those little pet pieves (mine is the overuse and incorrect use of the word 'literally'. You know, like "This camera literally sucks". Oh really? From where does the suction come?). It may be helpful to just look at this through the lens of just trying to point out something you might not have noticed, rather than trying to be critical of you.