I have been described as anal in some instances having a few "perfectionist" genes myself. I don't consider it an insult but rather a compliment. I would be happy to have an "anal" guy rebuilding my engine, or doing the bodywork on my car. Anal is just a dysphemism for perfectionist.
One of my old bosses used to give me the worst, hardes,t most expensive stuff to do on the job, where there was no going back up, ( finished product) to fix anything! if you screw it up, it's done....They called me Mr Technical..