Here are some insulting names or terms that start with the letter 'B':
- Bumpkin
- Buffoon
- Blockhead
- Brat
- Bonehead
- Bozo
- Blimp
- Bungler
- Bimbo
- Brown-noser
Please remember that using insulting names can be hurtful, and it’s always best to promote kindness and understanding in our interactions.