There are a few reasons why you might perceive people as being similar in Mannerisms to someone else you know, even though they have no connection with one another.

One reason is that we tend to Notice and remember similarities between people, rather than differences. This is known as the “similarity attraction effect.” When we meet someone new, our brains are constantly scanning for information that can help us to categorize them. If we notice that they have similar mannerisms to someone else we know, we may be more likely to categorize them as being similar to that person.

Another reason is that we may be unconsciously projecting our own experiences onto others. This is known as “projection.” For example, if you recently had a negative experience with someone who had a certain mannerism, you may be more likely to notice that mannerism in other people and to perceive them as being similar to that person.

Finally, it is also possible that the people you are observing actually are similar in some way. For example, they may have come from the same cultural background or may have had similar experiences in life. This can lead them to develop similar mannerisms.

Here are some examples of how these factors might play out in real life:

• You meet a new person who has a similar way of laughing to a friend of yours. You may be more likely to perceive this new person as being similar to your friend, even though they have no other connection.
• You recently had a negative experience with a customer at work who had a habit of drumming their fingers on the table. You may start to notice this mannerism in other customers and to perceive them as being more likely to be difficult.
• You are at a party and you meet two people who are from the same country. You may notice that they have similar mannerisms, such as the way they speak or the way they move their hands. This is because they may have been exposed to similar cultural influences.

It is important to be aware of these factors so that you can avoid making unfair judgments about people based on their mannerisms. It is also important to remember that everyone is an individual and that we should treat each other with respect.