Identifying Situational Irony in Prose

Read the following passage:

In a small town, there was a renownedly lazy man who would sit on his porch every day, basking in the sun, while his neighbors toiled in the fields. When harvest season arrived and everyone was busy gathering crops, this man declared with great pride, 'I guess doing nothing is the best way to enjoy life!'

The townspeople chuckled, knowing that he would have to help gather the harvest eventually when winter arrived. What type of irony is primarily at play in this passage?