I'm not sure what exactly you mean by, "subject to pressure", and I'm not sure whether it is free speech, or one's opinions that would be subject to pressure. The legality of free speech can be challenged on the basis of (among other things) its factual accuracy and ethical considerations; that's for the law to decide. One's opinions are not determined by the law; they are chosen by the individual that holds them. One may challenge the factual accuracy, and basis, of another's opinion, but I don't think ethics are of much use in changing a person's opinion. Ethics are more for modifying behavior than they are for modifying opinions.
There are a lot of opinions on a lot of different things. Tastes are just one narrowly defined set of opinions; they are a person's preferences. I don't think that they're subject to pressure of any sort.