Tom does notice and it isn't until Dee mentions the wheelchair that Tom realizes it is something health or physical related and not booze, exhaustion or something similar that is causing the issues.

"I'll get it." Tom had no problem, nor did he think less of people for physical limitations. At least Dee was more hospitable than when Vars' leg started acting up and limited his mobility. After a moment Tom returned with the wheelchair and offers what support Dee needs or will accept to get into the chair.

"Are you ok with vegetarian?" Tom asked while they were getting situated.