It is possible to include minority groups in a community without pandering or using reductive caricatures. It can be difficult if the community has little familiarity with the actual experiences of those minority groups. In that case, it would be important to seek out people who are from those minority groups, or who at least have a great familiarity with those groups, to direct efforts to grow the community in their direction.

If a person is anxious about being reprimanded for using an offensive stereotype, they do not have the expertise to employ "culturally appropriate" materials and ought to do more research/inquiry or delegate the responsibility of the outreach to somebody else.

Easy: get rid of the blocking factors.

As I just mentioned in another post: You don't need pink office chairs to make an environment welcoming for women. You just need not to have catcalls, rapists, abusers, sexist jokes, etc.

[Edit] And for a bonus round: don't focus on culture. If you're interviewing someone for a SWE job, don't ask if they played videogames when they were kids. There is a good chance that they were too poor to afford them, or they never got it as a gift because they were females and people didn't think females would play videogames.