What is art?
According to Merriam-Webster, art is the conscious use of skill and creative imagination especially in the production of aesthetic objects. Many people use memes in a way to express themselves and by definition it is a form of art.
In my opinion, memes are considered art as it is a way to share your thoughts and feelings in a particular subject. Reddit is a social media page with a wide variety of memes subreddits. My favorite meme themed subreddit will have to be /r/wholesomememes is it filled with kind-hearted memes and will lift your mood.