I once had a friend who I would consider a weeaboo.
She isn't japanese but she implies that she is japanese online. She has a japanese username and planting cute filters and rilakkuma stickers all over her photos and typing in hiragana in whatever phrases she learned in class. She likes anime, kpop, you name it.
I got no problem with that. Its just a username, its just her liking to use japanese phone apps to filter, deco, whatever. Thats cool. But I didn't think it was okay when she lied to people that she is japanese, especially boys who thought she was cute and messaged her thinking she was japanese. And I found it really weird that she kept shoving the country in a godly worshiping pedestal like its the best thing in the planet and she never once traveled to it.
The thing I get annoyed by is when she speaks in her "japanese anime baby girl" voice. She speaks in lung straining high pitched, tone and ends almost every single on of her sentences in either "desu" or "nee". And calls me "senpai" and I'm in the same grade as her. She often speaks random sentences to me too because she wants to speak with me in japanese. "my name" chan kawaii desu nee?" and I just answer in english. "No."
I talk to my mom who is Japanese, (like, legit Japanese. not Japanese american.) and I asked her what she thinks about these types of behaviors in Americans. (I had to explain to her the meaning of the word "weeaboo" she didn't know. But she knew "otaku".) She said "I think its nice that people are interested in Japan and what they like that Japan has to offer." and something else along those lines.
But in conclusion, I guess people are people. As long as anyone isn't mean, a bully, or being racist. Then its okay. I'm not really friends with her anymore not majorly because of her japan fetish, but more because of her personality.
But there is a reason why I don't ever join anime club in my schools.