umm is it bad netiquette to tell someone there's a spelling mistake in something they posted

im grey. 32 year old funny little guy (agender) from florida. artist, graphic designer, crochet bastard, yuri warrior, frog enjoyer, bad game enthusiast, and dwarf fortress understander who drinks too much iced tea. banned from twitter for being too epic and sexy.
commissions are OPEN!

ππΈπ
umm is it bad netiquette to tell someone there's a spelling mistake in something they posted