I would probably answer more politely had you done the same but since you didn't: I don't give a fuck what some casual moron thinks about whether I am lying or not, if you invested time and nerves to join a proper guild and actually work out strats and give your best to be 10/10M and someone is only 1 ilvl in difference while just spamming M+10 and Heroic, you'd be disheartened too.
Look, I'm sorry I hurt your feelings by being against a system that benefits normal-raiding, M+7 dwelling casual like yourself, but that doesn't make me a liar so much as it makes you someone that wants to keep getting loot showered at him.
As for your question - I've seen enough 380 weapons and trinkets from normals and 390 from heroics to know that it's pretty damn similar.