there is a difference between dismissal and entertaining an idea. i entertain some ideas that i dont actually believe as long as they are not totally disproven. scientific minded people can be open minded - that is how new technology keeps coming. if science was closed minded, it would not be the biggest force in technological and medical advancement that it is today.
but either way, some degree of objective evidence is the bridge between people who are not already inclined to agree. without that bridge, you get mental masturbation.
also, there are philosophical people and they have some degree of rigour to what they study and believe as well, because ultimately, meaningful discourse needs bridges between the participants.