Insults and Fallacies

Sorry if this has already been done before or doesn't belong here, but I have noticed a huge tone of insults and fallacies. At least in the last thread I was in.
For example, because person A was diagnosed with mental issues, then everything person A says must be false. This is a huge fallacy and can be hugely reversed. Because person B is an illusionist, then everything person B says must be false. Both of these are assuming that just because one has problems or one makes a living off of illusions, then nothing they say can be trusted.
Another example of that type is that because Person A may not be open to the possibility Subject A then they must be totally for all of the subjects and wear tin foil hats. The reverse can be seen as because Person B is not open to the possibility of Subject B, then they must be fully against all of the subjects and wear tin foil hats.
Of course, insults are going to happen, but to use them as the argument instead of saying, I think your argument is full of shit and here is why, is fallacious and ad homing.
Any thoughts? Arguments? Flamings?
For example, because person A was diagnosed with mental issues, then everything person A says must be false. This is a huge fallacy and can be hugely reversed. Because person B is an illusionist, then everything person B says must be false. Both of these are assuming that just because one has problems or one makes a living off of illusions, then nothing they say can be trusted.
Another example of that type is that because Person A may not be open to the possibility Subject A then they must be totally for all of the subjects and wear tin foil hats. The reverse can be seen as because Person B is not open to the possibility of Subject B, then they must be fully against all of the subjects and wear tin foil hats.
Of course, insults are going to happen, but to use them as the argument instead of saying, I think your argument is full of shit and here is why, is fallacious and ad homing.
Any thoughts? Arguments? Flamings?