Ask your husband what "quality" time means to him. See if you can get him to see his own faults. He isn't going to change anything if he doesnt see a problem with it. I think it is funny that he is demanding more "quality" time with him and then sends him off to play by himself!!! I would really ask your husband to DEFINE what QUALITY TIME is. It sounds like he wants it, but only on his terms, and that just isn't going to happen.
You could brainstorm ideas - write them down, put them in a hat/bowl/basket. When your husband starts his "whining" about not having enough time, pull an idea out, hand it to him and say "here you go! Have fun!!"
OR...when he starts complaining, say "you know, I have watched you play with Son and he really likes it when you ------------." Or "Son got really excited when he saw a big truck while we were driving yesterday. You should take him for a ride to go look for trucks". If he says he is tired, say "I was just trying to offer some suggestions for you to spend more quality time...if you are too tired, that is fine, but sometimes we need to put quality time before being tired".
Sometimes with men you need to be direct. If you sugar coat it, they just DONT GET IT!!! If you see him watching TV instead of playing with your son, say "You told me you wanted more quality time with your son. You watching TV while he plays alone in his room is not quality time WITH him"
Ask your husband what he needs from you in order to have more time with Son. Does he need those ideas? Does he need you to nag and "pull teeth"? Ask him directly - "What can I do to help you have more quality time with Son?" See what he says...make the conversation a learning tool, rather than an argument. Save the "argument" for when he sits down to watch TV alone 10 min after complaining about not having quality time :-)
MORE THOUGHTS ---- Look up "Screen Time Awareness" statistics or "children and television watching" online about how much time young children are exposed to TV watching, computer use, cell phone use, etc. There are some scary heartbreaking numbers out there. See what your husband thinks of those...
I constantly have to scold my husband for using the laptop while he is feeding my son snack, or watching TV while our son is awake and playing right in front of him...HUGE pet peeve of mine!!