This sentence is disdainful and the speaker like understimate with someone. In case, the speaker may be know about her/his life or ability before. The speaker will be recheck about her/his action after. But some cases , the speaker would like to help but he/she say no. The speaker may be angry so to speak this sentence with he/she and the others. However, Thai people in the past like to take care and look for everyone in the family and community.