Kind of disguesting habit that I've developed.

[GnomeKid]

Ok OP, serious time. You aren't going to like what I have to say - but hear me out.

As you can see, a lot of people are NOT cool with what you're doing.

I'll give you the benefit of the doubt and assume you'd really prefer not to be doing it either (you do call it disgusting in the thread title, after all).

You need to face that your anxiety is causing you to do things that are unacceptable. It's causing you to do things you don't want to do. It's stopping you doing things you want to do (as in, pee in the appropriate place). Your anxiety is out of hand. You are no longer in 100% control.

You need to get rid of the anxiety problem. One way to do that is to examine the thoughts behind it. Why exactly does the noise get to you? What about the noise is that bad, that it causes you to do things most people find unacceptable?

What about when you hear other people making that noise? How do you react then? What do you think about them?

If you are that worried about what people think, compare your actions - "Man pees in toilet, makes a slight tinkle noise" and "Man pees in disabled persons sink". Which sounds like the more socially appropriate action?

If you are unable to change your own thinking and continue to suffer from anxiety, then I strongly urge you to seek professional help. Going to the toilet is a something you are going to be doing several times per day for the rest of your life. For your own mental health, you really need to be able to do this task in an acceptable way without suffering from huge amounts of anxiety.

+1

and the difference between rinsing out an STP in a sink and pissing in a sink is the amount of urine.  Most of it will have already left the tubing and proceeded into its proper resting place of the toilet bowl.  A very VERY small amount will have left a thin coating on the insides of the tube.  Rinsing that out in a sink seems very logical, and not harmful.  No more harmful than getting a small bit of piss on your hand and washing it off.  When you piss into a sink the entire sink gets covered in your urine.  Rinsing it off is not enough.  You wouldn't brush your teeth with toilet water just because it'd been cleaned and flushed a few times, or maybe you would.  ew. you probably would.