Hi WP,
I'll post here what I was saying to you the other day, not because I think it's the One Right Answer, but because it will be interesting to see how it jives (or doesn't) with other peoples' answers.

I asked my family's rabbi about the "rule" that you can't be buried in a Jewish cemetery if you have a tattoo. He replied that there is no such rule, and that there is only one thing a person can do that will bar them from being buried in a Jewish cemetery, and that is apostasy- to abandon the Jewish faith.

Now, this doesn't address whether a tattoo would be considered disrespectful of tradition, or disrespectful of Holocaust tattooees. But disrespect won't get you barred from the cemetery. Unless, I suppose, the body-washers and the officiating rabbi or beadle decided to draw their own hard-line interpretation and bar a person from being buried in their particular cemetery. Maybe this has happened, I don't know, does anyone here have first-hand knowledge of someone being barred from burial?