So you txt him with "I have something for u 2 try" his son apparently reads it, he gets the shits and dumps you.
Sounds to me like he is the child here. You were only asking him to try the lasagna right? sounds like you are the blessed one here, move on and be happy it ended here I think.
Oh side note. I see his wife passed away, his son wouldn't be nasty to you on purpose as I am sure you know, he would be like this with anyone.
Good luck
