The speaker would not expect a foreigner to judge the people of that land. AT: "but even though he has no good reason to" (See: [[rc://en/ta/man/translate/figs-idiom]])
Here "has become our judge" is an idiom that means Lot is acting as if he can tell the men what actions are right or wrong. AT: "he acts as if he has the authority to tell us what is right and what is wrong" (See: [[rc://en/ta/man/translate/figs-idiom]])
The men are angry that Lot said, "Do not act so wickedly" ([Genesis 19:7](./07.md)), so they are threatening to act more wickedly than Lot had feared at first. AT: "we will act more wickedly with you than we will with them" (See: [[rc://en/ta/man/translate/figs-idiom]])
Possible meanings are 1) "They kept coming closer to the man, to Lot, until they were close enough to break down the door" or 2) they physically pushed Lot up against the wall or door of the house and were about to break the door down.