I think I agree with you.

1. No examples of these sassy comments; not a single one.
2. Account claims to be male but the username comes off as female @sarah2653@lemmy.ml
3. The account is primarily comprised of open-ended posts with nearly zero comments, so it doesn’t seem to be primarily concerned with actually thanking anyone for any of their input.

Conclusion: this post isn’t worth responding to or wasting any further brainpower on. Maybe even report it until OP gives evidence otherwise.