How do you define intrusive in this case?

If your subconscious mind suddenly reminds of that one time you said something stupid and embarrassing… Yeah, that happens to pretty much everyone. Just tell that thought that nobody remembers that day or cares about what anyone said, so carry on as usual. That’s just the human mind doing its thing, making sure we pay attention to social interactions. Humans are social animals after all.

If troublesome thoughts bombard your mind all the time and you’re having trouble living your normal life, consider talking to a mental health professional.