No, it is not necessarily rude to prefer not to be around people who smoke weed. Everyone has their own boundaries, preferences, and comfort levels when it comes to different behaviors and lifestyles. If you find that being around people who smoke weed makes you uncomfortable or is against your personal values, it's perfectly acceptable to distance yourself from such situations or individuals.
Respecting your own boundaries and values is important for maintaining your well-being and mental peace. However, it's essential to communicate your preferences respectfully and without judgment. You can politely decline invitations or explain your reasons for not wanting to be around marijuana use if the topic comes up.
Ultimately, you have the right to choose the company you keep, and it's crucial to surround yourself with people who respect and support your choices, just as you should respect theirs. It's about finding a balance that allows you to be true to yourself while also being considerate of others' feelings.