Correct. Is this a counter argument, or just an observation? Anon wants to do art as a hobby and has perfectly good reasons for it. If his mother thinks it's a waste of time, the solution is not to hide his 'true self' and his art from her and cripple himself in the process. You learn how to live with the difference. Parents are just people, and people have different opinions about stuff, part of being an adult (should figure this out when you're 13, honestly) is accepting this fact and making your own decisions.
Anon's parents sound terrible enough that it would probably be wiser to do the opposite of what they say. After all, he's only doing it as a hobby, the whole point of a hobby is to waste time doing something pleasurable. His parents should be harping on him about getting a job, not complaining about his hobbies if they really care whether he succeeds (presumably so that he can take care of them in old age, hopefully he abandons the selfish bastards, but again, we don't have a full picture of the relationship).