This 100 times. I have raised eyebrows before by declining to participate in a company hackaton or by saying I don't go to hackatons during a job interview.

Somehow saying that is a red flag although I gave them rational reasons:

- I have my own open source projects I would like to contribute to in my free time outside of work

- I am definitely not coming to a co-working space over the weekend (so losing my two days off when I could spend it with friends or doing my hobbies or just relaxing after week of work), work for free and eat unhealthy pizza and soda drinks so even my health suffers

Some companies will be shocked to hear this opinion.