The term "basher" can be seen as a negative label or insult for someone who frequently criticizes or complains about someone or something publicly. However, there are various synonyms that can be used depending on the context and the severity of the criticism. Some of these synonyms may include "critic," "censurer," "detractor," "fault-finder," "knocker," "naysayer," "opponent," "dissenter," "rebuker," "denouncer," and "hyper-critical." While these terms do not necessarily carry the same negative connotation as "basher," it is important to use appropriate language and tone when voicing opinions and criticisms to maintain constructive discussions.