45 Years of Subtle Annoyance

I have this one customer, I'll call him Cloyce just to give him a name, who is annoying in small ways. Many small ways. He never does anything so bad as to allow me a reason to throw him out of the Shop bodily. That's an aggravation by itself; you almost want the guy to become outlandish and obnoxious enough that you can tell him to go hell. I'm sure you have such a friend too. Quiet Ron.

Cloyce likes to do things such as inspect my work every time I do it. Every. Single. Time. On the one hand, I get it. A fella wants assurance that the thing he's about to pay for is done well and proper. On the other, he's watched me do stuff for 45 years (cue old guy stating emphatically, and perhaps angrily as though offended, 'I been doin' this for well on 45 years now') and I feel he ought to trust my abilities at this point.

The other day as I finished welding a fitting onto his drain snake cable he asked upon inspection, "You sure that's enough weld on there, Marty?"

What to do, what to say? "Here's the welding lead, Cloyce. How 'bout, rather than me doing it and charging you $40, you show me how it's done and I'll pay you forty bucks?" Or, "It's just like I've done it for the 45 years you've known me (a variation on the earlier old man rant) Cloyce. What's yer problem?" 

But then, why get mad? He's going to act the same damn way next time, ain't he?