Thank you for the opportunity to help you with your question!
According to my thinking its advisable for Juan to Listen with an open minded and be willing to acknowledge the validity of the other view point- Its very important for Juan to take good note of the point being lectured despite the fact of developing emotions.The point which is being discussed is another perspective which can be proven to be right or wrong.
Juan should not interrupt the lecturer while touching on an issue that relates to what he has experienced or gone through.He may also choose to wait for the topic to end and ask the lecturer the questions which maybe a big problem to him concerning animal rights. Thank you!
Please let me know if you need any clarification. I'm always happy to answer your questions.