Looks good to me. Ignore the facebook idiots as they have nothing better to do than be nasty to people that cannot get to them to challenge them face to face in other words they are cowards, IMHO that is.
Is that welded vert up? Spend a bit more time at the edges and a bit less time in the middle to even the bead out. Should have probably cleaned the steel too. It also looks a bit cold but I’m on my phone and the pic isn’t that clear. It’s not too bad though, seen a lot worse.
Take this as being constructive, the weld is cold, the bead is too convex and the toes are not blended in, you need more power, getting rid of the rust in the joint wouldn't hurt either, I dont know what it is and it is most likely strong enough for its intended purpose, but would be a fail in an industrial situation.