A friend of mine recently did me the favor of spreading the word that I'm looking for a job in an online community of CTOs. I've received a few feeler emails from a few companies thanks to his recommendation. I'm interested in some and I'm uninterested in others. None of them are for specific positions. The reasons I'm not interested range from the particular company's reputation to my own personal disinterest in their particular industry.
Should I respond to the feelers I'm not interested in? Or should I just ghost/ignore them? If I should respond, how can I say I'm not interested without burning a bridge or coming off like a jerk?