What I do is be excessively slow to take on new ideas and chew on them in a sandbox. There is no such thing as strong memetic sandboxing, but it slows the ingress of bad ideas. And good ones, but hey.

If you find you're too susceptible to incoming memes, which appears to be what you're describing, then consciously trusting your intuitions further seems likely to lead to better results than what you're doing now.

This may lead to some degree of inconsistency and compartmentalisation (memetic sandboxing being akin to deliberate compartmentalisation), but the results will, I think, still be less worse than what you're getting now.