Buddhism and the Diet Practices view from other religion

Since ever i have the half vegetarian diet practices, i have problem below with the society especially with the close friends. Ques: How to handle the scenario below or how to answer them to make them comfort/understand base on Buddhism or logic. Well, Buddhism is base on logic right? 1. Plants also has consciousness, and then why do you eat it? -> Hope someone has strong biological knowledge background also able to answer this? Does plant has consciousness? If really yes, how do we handle it? 2. Some other religions follower may disagree/dis-comfort/against when i avoid meat and we cant enjoy the common meal or so call "good food". Feedback from them is diet should be balance or simply the Bible or Quran written so they allow to eat it? I felt i am against their God's will. The tough part is when my partner is inviting me to Christ, they will pray for thankfulness for the food. I just can't do it to pray together especially when eating those meat like Sushi with a lot of eggs on top, it has a lot lives inside. 3. Sometime when i try to explain those animal or fish killed alive is very crude too. i.e. Lobster and it will scream when we boiled it alive. Lobster is best to be boiled alive to serve as food. And then, i will like start losing a friend because when they know the truth and most of the time truth doesn't bring happiness. I know my mistake is the choice of words when explaining about diet. Any guide for this specific topic?