That’s actually a very common myth on here that people believe, you do not get points when someone comments on your image or replies to your comment.
Points table
1 upvote on a meme of yours = 40 points
1 upvote on a comment of yours = 30 points
Submitting an image = 20 points
Commenting on an image = 2 points
Commenting on an image with an image = 4 points (only works once)