The idea that "Americans make fun of British people" is a broad generalization. While lighthearted teasing about accents (e.g., "aluminum" vs. "aluminium"), spelling, tea obsession, or reserve exists in comedy and internet culture, it is:
Healthy banter between allies is normal. Reducing either nation to a punchline ignores the immense diversity within both populations. Mutual respect and curiosity are far more representative than mockery.