Okay, so when we talk about opinions, we are talking about how people think or feel about something. It's like saying "I like pizza" or "I don't like broccoli." These are opinions because they are based on what people prefer.
Now, imagine there's something called "anti-matter of opinion." This means that some people might have the opposite opinion of what you have. For example, if you say "I like pizza," someone with the anti-matter of opinion would say "I don't like pizza." Or if you say "I don't like broccoli," someone with the anti-matter of opinion would say "I like broccoli."
So, basically, anti-matter of opinion is like the opposite of what you think or feel about something. It's important to remember that everyone is entitled to their own opinions, even if they are different from yours or the anti-matter of your opinion. It's okay to have different preferences!