I think you should be showing basic respect and courtesy to everyone, not just those in authority positions or people you feel have “earned” your respect.
This is unnecessary.
Although their phrasing may have been initially abrupt they then tried to clarify, I think you are somewhat misconstruing their point. I read their point as highlighting that language learning is hard, and that at some point you will have to get used to dealing with ambiguity, therefore you should try become acclimatised to ambiguity earlier to save yourself grief later.
Seriously, unnecessarily gendered and demeaning language.
Wow, this is way out of line. This is elitist and ableist.
Learning a language isn’t a race, you have zero idea what this person’s situation or priorities are, and regardless, they are irrelevant. You shouldn’t be attacking another user’s ability or ‘skill’.