I assume Walter is aware that making his son drink this much when he doesn't normally drink will probably make him extremely unhealthy and cause a big scene (like it did). Walter's dialog seems to imply this is about "control", but I don't see how this behavior increases his control or displays his masculine dominance over Hank or anything like that; if anything it just makes him look unhinged and Hank look like the mature, responsible guy (which is not what Hank normally looks like). If he was jealous that Walter Jr was talking to Hank more than him, I think he would've tried starting a conversation with Walter Jr at least once before doing whatever this was.