I don’t think you’re a fauxtog – you’re someone who’s just starting out – that’s very different. Unless you are charging money? I get the impression you’re not but then question the need for a watermark?
Tbh, he does sound like a bit of an asshole. I would be mad if my partner told me my work was pants – even if it was lol! Let people who don’t know you give objective opinions – he’s supposed to tell you you rock! OR at least be nice about telling you you don’t! 🙂