Employment Law Questions? Ask an Employment Lawyer.
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It is possible it violated ADA, that is always a fact based issue.
However, did you report the comments to any supervisors before you were terminated?
The problem that you have is that normally the company won't be held responsible for other employee's actions unless you reported them to a supervisor or HR and they failed to take any action. The exception to this would be if the employer told the other employees to treat you this way.
Regardless, if you think you ever want to pursue them then you have to file a charge of discrimination with the EEOC. You can find a local office through their website at www.eeoc.gov.
As to the termination, if you made the remark "I could empathize with office shooters" then if they say they terminated you due to that remark and the judge believes them then it will be found a valid reason for termination. Every state except for Montana is an employment at will state which means an employer can terminate you for any reason or no reason, they just can't do it for an illegal reason like because of your race, age, gender, disability, etc.
Your next step is to file the complaint with the EEOC anyway since if you don't do that then you can never pursue them. It doesn't cost you anything to file with them and they will investigate and they may turn up something that helps your case.