First, the structure of the most teleological arguments is as follows:
(1) All things that are complex were designed.
(2) The world we live in is a thing that is complex.
Therefore, (3) The world we live in was designed.
The argument above is sometimes supported by an analogy of a clock in a desert such that when we find a clock in a wild desert we are supposed not to think the clock was automatically produced there but to think that someone made the clock and put it there, and the like.
Second, the thought that is expressed in the teleological arguments, i.e., similarity between complex things (e.g. the clock in the desert) and the world we live in is seriously wrong due to the following reasons. Some similarities exist, but they are not sufficient to support the teleological arguments. The number of differences between the clock in the desert and the world we live in is higher than the number of common points between them. So, it's the trick in the teleological arguments. If some people accepted the teleological arguments without reflections, then they would be foolish such that they can't distinguish different things from the same things.
Now, here's the argument to get people out of the magic of the teleological arguments:
(1) All arguments that make people foolish to be unable to distinguish similar (or the same) things from different (or not the same) things are very wrong.
(2) The teleological argument is an argument that makes people foolish to be unable to distinguish similar (or the same) things from different (or not the same) things.
Therefore, (3) The teleological argument is very wrong.
The thought in the teleological arguments is not acceptable for its unintelligent nature.