I've been in dozens of these conversations and they almost always go the same way.
1. People with next to no experience with the tool hate them.
2. Those people say that the tool is cruel.
3. They base their opinions on emotions rather than logic and reason.
4. They often approach hysteria in their quest to "badmouth" the tool.
5. They won't listen to facts.
6. They have some idea about how the tool is used, and it's usually one they've heard, rather than seen.
7. They may have seen an Ecollar used but it was an older model, not the modern tools available today.
8. They use the phrase "zapped into submission."
9. They talk about pain.
10. They talk of their experience with dog training which is usually very limited, often only to a couple of their own pets.
11. They continue in their beliefs no matter what information is presented to them.
Now on the upside. People with open minds learn something about the tool. Many new users are converted or at least inquire as to their proper use.