What is it called when like minded people agree with each other praise in a discussion

Circle jerk?

• (vulgar, slang, figuratively) Any group activity performed for personal gratification.

• (Internet slang) An online community where a group of people form an echo chamber.

(echo chamber - an insular communication space that is of no interest to outsiders or refuses their input.)

That could be called a "mutual admiration society" where everyone agrees and praises each other which sometimes is counterproductive.

From Wordnik:

n. A group of two or more people, in a workplace or other social environment, who routinely express considerable esteem and support for one another, sometimes to the point of exaggeration or pretense.

A less-vulgar alternative than circlejerk is to say that the people are engaging in groupthink.

The first two paragraphs from Wikipedia:

Groupthink is a psychological phenomenon that occurs within a group of people in which the desire for harmony or conformity in the group results in an irrational or dysfunctional decision-making outcome. Group members try to minimize conflict and reach a consensus decision without critical evaluation of alternative viewpoints by actively suppressing dissenting viewpoints, and by isolating themselves from outside influences.

Groupthink requires individuals to avoid raising controversial issues or alternative solutions, and there is loss of individual creativity, uniqueness and independent thinking. The dysfunctional group dynamics of the "ingroup" produces an "illusion of invulnerability" (an inflated certainty that the right decision has been made). Thus the "ingroup" significantly overrates its own abilities in decision-making and significantly underrates the abilities of its opponents (the "outgroup"). Furthermore, groupthink can produce dehumanizing actions against the "outgroup".