Milhouse, your comment may be factual but there’s a difference. No one says their aveira is okay “because I’m Chareidi”; otoh, you will *often* find those that attribute their being MO as a justification as to why its okay for them to do their aveira, and why their aveira isn’t even an aveira because it’s the MO custom or the MO way or okay to do since they’re MO and they don’t subscribe to Chareidi shittos.
There’s many examples aside from eating at non-kosher certified restaurants, which is less common than other things such as mixed swimming (“we’re an MO bungalow colony”), ignoring shomer negia, etc.