Ick, John is 12 at this point of the story remember? :wacko:
As for Gathan's attitude towards his future father-in-law, let's review from a different perspective:
1) July 4 Gathan was put down by high-society Mrs. Finch because she thought he was not good enough.
2) July 11 Gathan was shot by someone who thought Brad and Stef was not good enough for Texas.
3) July 18 Loser Josh Grover attempts to put down Gathan.
4) July 19 Gathan was un-adopted by Wally and Clara (mostly Clara)
5) July 23 Brad and Will gets kidnapped in France
6) July 25 Kristen almost gets herself killed on a doomed Concord Flight.
7) July 28 Gathan gets arrested under trumped up charges of rape.
8) Aug 2 --> Dinner with Mr. H and his "Let me explain it to you as if you are a moron" attitude....
Of course, this brief time line does not include moving out of Wally and Clara's house, giving up his old truck, putting up with closet case Zach, outing himself towards Kristin, and finding out Kristin is telling everyone they are getting married.
And you want to know why Gathan was not more respectful towards Mr. H??? :wacko: