I always opt for the glass if possible. Our health is worth the extra money involved. But I sometimes purchase peanut butter in plastic. We decided to start getting that in glass also. You can see if they will take it back or you may want to just continue to use it to see if you still have the same reaction. Sometimes our system can be off and it may just be a fluke. But if you continue to get a soapy taste, it might be better if they will take it back.