Balsamic vinegar ok??

Have any of you heard or been told not to use this dressing? I am freaking out cause I just had a grilled chicken with salad these past couple days all with balsamic dressing... then I read one thing that said you may not want to do of course now I’m worrying.... most places say not to worry but that one post made me nervous :(

I’m trying to be active and eat healthy and do everything right and now I feel like I’m not..